Conclusion from Lenstip “As a result we got a lens physically smaller and lighter than the Sigma S 150-600 mm, sharper, and with a wider focal range too! The tested Sigma S 60-600 mm is worse than the whole armada of 150-600 or 200-500 mm lenses when it comes to vignetting, distortion, and chromatic aberration but only at the 60 mm focal length...”